JP2001333537A - Power supply facility - Google Patents
Power supply facilityInfo
- Publication number
- JP2001333537A JP2001333537A JP2000150880A JP2000150880A JP2001333537A JP 2001333537 A JP2001333537 A JP 2001333537A JP 2000150880 A JP2000150880 A JP 2000150880A JP 2000150880 A JP2000150880 A JP 2000150880A JP 2001333537 A JP2001333537 A JP 2001333537A
- Authority
- JP
- Japan
- Prior art keywords
- generator
- power supply
- current
- bus
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自家発電設備を有
して負荷に給電する電源設備に係り、特に地絡や短絡事
故発生時に発電機から電源母線側に過大な短絡電流が流
れるのを抑制する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system having an in-house power generation system for supplying power to a load, and more particularly, to preventing an excessive short-circuit current from flowing from a generator to a power supply bus when a ground fault or short-circuit accident occurs. It relates to a device for suppressing.
【０００２】[0002]
【従来の技術】本発明に係わる電源設備として、自家発
電設備を電力系統と連系した受電設備例を図２に示す。
高圧配電線から受電変圧器１等によって降圧し、電源母
線２に受電する。電源母線２には自家発電機３、４を連
系可能にし、多くの負荷５に給電する。2. Description of the Related Art FIG. 2 shows an example of a power receiving facility in which a private power generating facility is connected to a power system as a power source facility according to the present invention.
The voltage is lowered from the high-voltage distribution line by the power receiving transformer 1 or the like, and the power is supplied to the power supply bus 2. Private power generators 3 and 4 can be connected to the power supply bus 2 to supply power to many loads 5.
【０００３】このような受電設備や系統と連系しないで
自家発電設備のみにした電源設備において、新規に発電
機６を増設する場合、発電機６に対して受電設備の短絡
容量が小さいと、発電機６を直接に電源母線に接続する
と短絡時の過電流に対応できなくなる。[0003] In such a power supply facility that is only a private power generation facility without being connected to a power reception facility or a system, when a new generator 6 is newly added, if the short-circuit capacity of the power reception facility relative to the generator 6 is small, If the generator 6 is directly connected to the power supply bus, it will not be possible to cope with an overcurrent at the time of a short circuit.
【０００４】そこで、発電機６のインピーダンスを高く
した特殊設計で短絡電流を抑制する方法、または図示の
ように、発電機６に直列接続で限流リアクトル７を介在
させることで短絡電流を抑制する方法が採られる。Therefore, a short-circuit current is suppressed by a special design in which the impedance of the generator 6 is increased, or a short-circuit current is suppressed by interposing a current-limiting reactor 7 in series with the generator 6 as shown in the figure. A method is adopted.
【０００５】[0005]
【発明が解決しようとする課題】従来、電源設備の短絡
容量が不足する場合の対策として、発電機自体のリアク
タンスを大きくした特殊設計の場合、標準発電機を使用
できないため割高になる。また、リアクタンスを大きく
するため、発電機自体の電圧変動範囲を大きくしたもの
を必要とする。Conventionally, as a countermeasure against shortage of short-circuit capacity of power supply equipment, in the case of a special design in which the reactance of the generator itself is increased, it becomes expensive because a standard generator cannot be used. Further, in order to increase the reactance, a generator having a wide voltage fluctuation range of the generator itself is required.
【０００６】一方、限流リアクトルを設ける場合、リア
クトル自体での電圧降下が大きくなるし、その損失が発
生し発電効率をさげる。On the other hand, when a current limiting reactor is provided, a voltage drop in the reactor itself increases, and a loss occurs, thereby reducing power generation efficiency.
【０００７】また、いずれの方法も等価的に大きなリア
クタンスが介在するため、電源設備の定態安定度が悪く
なる。[0007] Further, in any of the methods, since a large reactance is equivalently interposed, the steady state stability of the power supply equipment deteriorates.
【０００８】本発明の目的は、設備の短絡容量が不足す
る場合に、発電機の短絡電流を抑制しながら前記の課題
を解決できる電源設備を提供することにある。[0008] It is an object of the present invention to provide a power supply equipment capable of solving the above-mentioned problems while suppressing a short-circuit current of a generator when the short-circuit capacity of the equipment is insufficient.
【０００９】[0009]
【課題を解決するための手段】本発明は、限流リアクト
ルは、電源母線側に短絡事故が発生したときのみ発電機
電流を制限すればよいことに着目し、限流リアクトルに
並列に交流スイッチ回路を設け、通常時には交流スイッ
チを閉にして低いリアクタンスで母線に給電し、事故発
生で短絡電流が流れようとするときにスイッチ回路を開
にし、その高いリアクタンスで短絡電流を抑制するよう
にしたもので、以下の構成を特徴とする。SUMMARY OF THE INVENTION The present invention focuses on the fact that the current limiting reactor only has to limit the generator current when a short circuit accident has occurred on the power supply bus side, and an AC switch is provided in parallel with the current limiting reactor. A circuit is provided, and the AC switch is normally closed to supply power to the bus with low reactance, and when a short circuit current is about to flow due to an accident, the switch circuit is opened and the high reactance suppresses the short circuit current. And is characterized by the following configuration.
【００１０】自家発電設備を有して負荷に給電する電源
設備において、前記自家発電設備は、発電機と電源母線
との間に設けられ、該母線側の事故時に該発電機から母
線側に流れる短絡電流を該母線側の短絡容量以下に制限
できるリアクタンスにした限流リアクトルと、前記限流
リアクトルに並列に設けられ、通常時には閉にされて前
記発電機を前記限流リアクトルを迂回して電源母線側に
接続する交流スイッチ回路と、前記母線側の電圧低下を
検出したときに前記交流スイッチ回路を開に制御する電
圧低下検出リレーとを備えたことを特徴とする。In a power supply system having a private power generation facility for supplying power to a load, the private power generation facility is provided between a generator and a power supply bus, and flows from the generator to the bus side when an accident occurs on the bus side. A current-limiting reactor having a reactance capable of limiting a short-circuit current to the short-circuit capacity or less on the bus side, and a current-limiting reactor which is provided in parallel with the current-limiting reactor and which is normally closed to bypass the current-limiting reactor to supply power to the generator. An AC switch circuit connected to the bus side, and a voltage drop detection relay that controls the AC switch circuit to open when a voltage drop on the bus side is detected are provided.
【００１１】[0011]
【発明の実施の形態】図１は、本発明の実施形態を示す
電源設備であり、図２の受電設備に適用した場合であ
る。同図が図２と異なる部分は、限流リアクトル７に並
列に交流スイッチ回路８を設け、このスイッチ回路８の
開閉を電圧低下検出リレー９で制御する点にある。FIG. 1 shows a power supply equipment according to an embodiment of the present invention, which is applied to the power reception equipment shown in FIG. 2 differs from FIG. 2 in that an AC switch circuit 8 is provided in parallel with the current limiting reactor 7, and the opening and closing of the switch circuit 8 is controlled by a voltage drop detection relay 9.
【００１２】交流スイッチ回路８は、例えば、トライア
ックなど、一対のサイリスタを逆並列接続した半導体素
子で構成されて外部からオン・オフ制御を可能にする。
また、ＧＴＯなど自己消弧形半導体素子を使用すること
ができる。また、交流スイッチ回路８の電流容量は、例
えば、発電機６の定格電流の２倍程度にされる。The AC switch circuit 8 is composed of a semiconductor element such as a triac in which a pair of thyristors are connected in anti-parallel, and enables on / off control from outside.
In addition, a self-extinguishing type semiconductor element such as GTO can be used. The current capacity of the AC switch circuit 8 is, for example, about twice the rated current of the generator 6.
【００１３】電圧低下検出リレー９は、例えば、受電設
備の保護継電装置に備える不足電圧リレーを利用し、電
源母線２の電圧が一定レベルまて低下したことを検出
し、この検出で交流スイッチ回路８に開信号を与える。The voltage drop detection relay 9 uses, for example, an undervoltage relay provided in a protection relay device of the power receiving equipment, detects that the voltage of the power supply bus 2 has dropped to a certain level, and uses this detection to detect an AC switch. An open signal is given to the circuit 8.
【００１４】以上の構成において、発電機６を運転中の
通常時には、スイッチ回路８を閉にしておき、発電機６
からは限流リアクトル７を迂回して交流スイッチ回路８
を通して低いリアクタンスで電源母線２に給電する。In the above configuration, during normal operation of the generator 6, the switch circuit 8 is closed and the generator 6 is closed.
From the AC switch circuit 8 bypassing the current limiting reactor 7
To the power supply bus 2 with a low reactance.
【００１５】そして、電源母線２等が短絡、地絡事故で
その電圧が低下したとき、この電圧低下を電圧低下検出
リレー９が検出し、スイッチ回路８を系統周波数の１サ
イクルまたは半サイクル以内で開にする。これにより、
発電機６からの短絡電流は限流リアクトル７で抑制さ
れ、電源母線が過電流になる前に保護継電装置による保
護を得ることができる。When the voltage of the power supply bus 2 or the like drops due to a short circuit or ground fault, the voltage drop detection relay 9 detects this voltage drop, and switches the switch circuit 8 within one cycle or half a cycle of the system frequency. Open. This allows
Short-circuit current from the generator 6 is suppressed by the current limiting reactor 7, and protection by the protective relay can be obtained before the power bus becomes overcurrent.
【００１６】したがって、本実施形態によれば、通常時
には発電機６から電源母線２までのリアクタンスを小さ
くし、限流リアクトル７による電圧降下、損失を無くし
た給電ができる。Therefore, according to the present embodiment, during normal operation, the reactance from the generator 6 to the power supply bus 2 can be reduced, and power can be supplied without voltage drop and loss due to the current limiting reactor 7.
【００１７】また、発電機６は、電源母線の短絡容量に
かかわらず、割安の標準の発電機を使用できる。また、
特殊発電機による電圧変動や定態安定度の点でも優れ
る。Further, the generator 6 can be a cheap standard generator regardless of the short-circuit capacity of the power supply bus. Also,
It is also excellent in terms of voltage fluctuation and steady state stability caused by a special generator.
【００１８】なお、本実施形態は、系統と連系する受電
設備に適用した場合を示すが、系統と連系しない自家発
電設備による電源設備に適用して同等の作用効果を得る
ことができる。Although the present embodiment shows a case where the present invention is applied to a power receiving facility connected to a grid, the present embodiment can be applied to a power source facility using a private power generating facility which is not connected to a grid, and can obtain the same operation and effect.
【００１９】[0019]
【発明の効果】以上のとおり、本発明によれば、限流リ
アクトルに並列に交流スイッチ回路を設け、通常時には
交流スイッチを閉にして低いリアクタンスで母線に給電
し、事故発生で短絡電流が流れようとするときにスイッ
チ回路を開にし、その高いリアクタンスで短絡電流を抑
制するようにしたため、設備の短絡容量が不足する場合
に、発電機の短絡電流を抑制し、しかも通常時には発電
機から電源母線までのリアクタンスを小さくし、限流リ
アクトルによる電圧降下、損失を無くした給電ができ
る。また、発電機は、電源母線の短絡容量にかかわら
ず、割安の標準の発電機を使用できる。また、特殊発電
機による電圧変動や定態安定度の点でも優れる。As described above, according to the present invention, an AC switch circuit is provided in parallel with a current limiting reactor, and the AC switch is normally closed to supply power to the bus with low reactance, and a short-circuit current flows when an accident occurs. The short circuit current is suppressed by the high reactance by opening the switch circuit when trying to do so, and when the short circuit capacity of the equipment is insufficient, the short circuit current of the generator is suppressed. Reactance to the bus can be reduced, and power can be supplied without voltage drop and loss due to the current limiting reactor. In addition, a cheap standard generator can be used regardless of the short-circuit capacity of the power supply bus. It is also excellent in terms of voltage fluctuation and steady state stability caused by a special generator.
【図１】本発明の実施形態を示す受電設備の例。FIG. 1 is an example of a power receiving facility according to an embodiment of the present invention.
【図２】従来の受電設備の例。FIG. 2 is an example of a conventional power receiving facility.
１…変圧器 ２…電源母線 ３、４…発電機 ５…負荷 ６…増設する発電機 ７…限流リアクトル ８…交流スイッチ回路 ９…電圧低下検出リレー DESCRIPTION OF SYMBOLS 1 ... Transformer 2 ... Power supply bus 3, 4 ... Generator 5 ... Load 6 ... Additional generator 7 ... Current limiting reactor 8 ... AC switch circuit 9 ... Voltage drop detection relay
Claims (1)
源設備において、 前記自家発電設備は、 発電機と電源母線との間に設けられ、該母線側の事故時
に該発電機から母線側に流れる短絡電流を該母線側の短
絡容量以下に制限できるリアクタンスにした限流リアク
トルと、 前記限流リアクトルに並列に設けられ、通常時には閉に
されて前記発電機を前記限流リアクトルを迂回して電源
母線側に接続する交流スイッチ回路と、 前記母線側の電圧低下を検出したときに前記交流スイッ
チ回路を開に制御する電圧低下検出リレーとを備えたこ
とを特徴とする電源設備。1. A power supply system having an in-house power generation facility for supplying power to a load, wherein the in-house power generation facility is provided between a generator and a power supply bus. A current limiting reactor having a reactance capable of limiting the short-circuit current flowing to the bus-side short-circuit capacity or less, and provided in parallel with the current-limiting reactor and normally closed to bypass the generator to bypass the current-limiting reactor. A power supply system comprising: an AC switch circuit connected to a power supply bus side via a power supply; and a voltage drop detection relay that controls the AC switch circuit to open when a voltage drop on the bus side is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000150880A JP2001333537A (en) | 2000-05-23 | 2000-05-23 | Power supply facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000150880A JP2001333537A (en) | 2000-05-23 | 2000-05-23 | Power supply facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001333537A true JP2001333537A (en) | 2001-11-30 |
Family
ID=18656516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000150880A Pending JP2001333537A (en) | 2000-05-23 | 2000-05-23 | Power supply facility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001333537A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT508242B1 (en) * | 2009-04-10 | 2015-05-15 | Andritz Hydro Gmbh | ENERGY INJECTION INTO A CURRENT NETWORK |
| JP2016059168A (en) * | 2014-09-09 | 2016-04-21 | 富士電機株式会社 | Bus voltage stabilizer |
| CN109962448A (en) * | 2019-02-02 | 2019-07-02 | 中国电力科学研究院有限公司 | Short circuit current based on voltage characteristic dissolves branch input control method and device |
-
2000
- 2000-05-23 JP JP2000150880A patent/JP2001333537A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT508242B1 (en) * | 2009-04-10 | 2015-05-15 | Andritz Hydro Gmbh | ENERGY INJECTION INTO A CURRENT NETWORK |
| JP2016059168A (en) * | 2014-09-09 | 2016-04-21 | 富士電機株式会社 | Bus voltage stabilizer |
| CN109962448A (en) * | 2019-02-02 | 2019-07-02 | 中国电力科学研究院有限公司 | Short circuit current based on voltage characteristic dissolves branch input control method and device |
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